23 CFR § 490.703 - Applicability.
---
identifier: "/us/cfr/t23/s490.703"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "23 CFR § 490.703 - Applicability."
title_number: 23
title_name: "Highways"
section_number: "490.703"
section_name: "Applicability."
chapter_name: "FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "E"
subchapter_name: "PLANNING AND RESEARCH"
part_number: "490"
part_name: "NATIONAL PERFORMANCE MANAGEMENT MEASURES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "23 U.S.C. 134, 135, 148(i) and 150; 49 CFR 1.85."
regulatory_source: "81 FR 13913, Mar. 15, 2016, unless otherwise noted."
cfr_part: "490"
---
# 490.703 Applicability.
The CMAQ Traffic Congestion performance measures are applicable to all urbanized areas that include NHS mileage and with a population over 1 million for the first performance period and in urbanized areas with a population over 200,000 for the second and all other performance periods, that are, in all or part, designated as nonattainment or maintenance areas for ozone (O<sub>3</sub>), carbon monoxide (CO), or particulate matter (PM<sub>10</sub> and PM<sub>2.5</sub>) National Ambient Air Quality Standards (NAAQS).